Aligning jig



.W. A. FORBESS AND C. R. AMES.

AIEIGNING ms.

APPLICATION FILED JUNE 16, 1921.

1,428,224.. n pt- 5,1922;

Y I 'fflaiiryfi 5 52 5555 C716 f irfiflmea,

Patented ep.t. 5, i922.

Uftli'f'fli) a at HALTER A. FORBESS, OF BURLINGTON, EVASHINGTON, AND CHESTER It. AMES, OF SEDBO WOOLLEY, WASHINGTON.

ALIGNING JIG.

To all to 710m it 17? my concern:

Be it known that we, WALTER A. Fonenss, a citizen of the United States, residing at Burlington, in the county of Skagit and State of Vashington, and Cnns'rna R. AMns, a citizen of the United States, residing at Sedro Voolley, in the county of Skagit and State of Washington, have invented a new and useful Improvement in Aligning Jigs, of which the following is a specification.

The present invention relates to devices for aligning piston and connecting rods and will be fully understood from the following description thereof, illustrated by the accompanying drawings, in which Fig. 1 is a side elevation of the device;

F 2 is an end elevation thereof;

F 3 is a plan view of the device, and

Fig. l is a sectional view on line 4.-l of Fig. 3.

Referring more particularly to the drawings, the numeral 10 indicates a support or base, upon which is mounted the hearing or journal 11, which is preferably formed integrally with the base 10. A section 12 of the upper half of the bearing is separated from the remainder of the bearing by kerfs except on one side of the bearing, and serves as a clamp for the mandrel 13 in serted in the bearing 11. Thisclamp section 12 is thus resiliently mounted on one side of the journal, and may be tightened upon the mandrel by means of clamp-screw 14. The ends of the mandrel are turned down so that the bearing of a piston rod may be fitted thereon. It is readily apparent that different mandrels may be provided for piston rods having different sized bearings and that, if desired. the two ends of each mandrel may be of different sizes.

A vertical face plate 15 rises above the mandrel clamp bearing 11, being preferably mounted upon and formed integrally with the bearing 12. The face of this plate is a substantially true plane perpendicular to the axis of the mandrel and serves for the proper alignment of the piston rod with the sides of the piston. A horizontal platform 16 is mounted upon the support 10 and is provided with the elevated parallel hori zontal rails 17, the upper surfaces of which are in substantially a horizontal plane slightly below the axis of the mandrel 13. The platform 16 is spaced horizontally from the mandrel clamp so that the wrist-pin of a piston rod mounted upon a mandrel sup ported in the clamp will rest on the horizontal rails 17, the surfaces of which are in the same horizontal plane parallel to the mandrel axis.

In testing a piston or connecting rod, it

start is clamped on a mandrel of suitable size,

which may have previously been placed in the bearing 11. The clamp section 12 being loose, the mandrel with the piston rod is turned until the wrist-pin rests on one or both the coplanar horizontal rails 17. If

it rests on only one of the rails, as shown in dotted lines inFig. 4, the rod is twisted, for example, by means of a wrench, until the wrist-pin rests on both rails, as shown in full lines in Fig. 4. The parallelism of the wrist-pin with respect to the crank shaft is then determined by placing upon the rails the upright 18 provided with vertical surfaces 19 parallel to the axis of the mandrel 18 and sliding it against the wristpin. If the latter does not touch both vertical surfaces, the piston rod is bent with a wrench or other suitable device until the wrist-pin is touched by both vertical surfaces 1.9 as well as by the horizontal surfaces of both rails 17.

To test the parallelism of the piston and connecting rod, the rod, with the piston at tached, is tightened on the mandrel and the clamp screw 13 is loosened. With the piston rod vertical the mandrel is then moved inwardly until the piston'touches the face plate. It is in parallelism with respect to the piston rod when it touches the face plate for its (the pistons) entire length.

It is readily apparent that the device of our invention is practically universal in its application and may be used for testing pistonrods of varying sizes and lengths. It is very simple in construction and great accuracy may be secured by its use.

We claim:

1. A piston rod testing device comprising a mandrel upon which a piston rod may be mounted, a pair of rigidly mounted spaced rails having coplanar surfaces substantially parallel to the axis of the mandrel and spaced therefrom whereby the surfaces of said rails are adapted to engage the wrist pin of a piston rod mounted on the mandrel, and a member slidable upon said rail and having a surface perpendicular to the 10 whereby a piston rod mounted upon said mandrel may be tested by engagement of the piston with said face, and a pair of spaced rails having coplanar surfaces substantially parallel to the axis of the mandrel and spaced therefrom whereby the surfaces of said rails serve as a gage and rest for the wrist pin of a piston rod mounted on the mandrel.

WALTER A. FORBESS. CHESTER R. AMES. 

